Thanks for your question. I agree with you . . . having a brand name or a cartoon-type image could distract from the perfection of homemade canned foods. I've been hunting for a canning jar source that sold plain lids for a while.

I found Gold Harvest mason jars available, in your choice of plain, bronze or tin lids, at Rural Root. I suggest you also ask at your local kitchen store or hardware store.

If you're here in New York City, The Brooklyn Kitchen should be able to help you. They have a canning section and if they don't have plain jars in stock, they should be able to order them for you.